论文部分内容阅读
一形式推广若点P(x0,y0)是圆C:(x-a)2+(y-b)2=r2上一点,则在点P处的圆的切线l的方程为(x0-a)(x-a)+(y0-b)(y-b)=r2。证明:设M(x,y)为切线l上不同于点P的任意一点,
A form of generalization is that if the point P (x0, y0) is the previous point of the circle C: (xa) 2+ (yb) 2 = r2 then the equation of the tangent line l to the circle at point P is (x0- + (y0-b) (yb) = r2. Proof: Let M (x, y) be a point on tangent l that is different from point P,